$60x^3-70x^4$
$\frac{x}{3}-2y^2$
$\int\frac{2x+1}{9+x^2}dx$
$8t^0+2t^0$
$9a^4+42a^2+49$
$10\ln\left(x^2+4\right)+8\ln\left(2x-5\right)$
$1-78$
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